/* * ACPI implementation * * Copyright (c) 2006 Fabrice Bellard * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License version 2 as published by the Free Software Foundation. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see * * Contributions after 2012-01-13 are licensed under the terms of the * GNU GPL, version 2 or (at your option) any later version. */ #include "hw/hw.h" #include "hw/i386/pc.h" #include "hw/isa/apm.h" #include "hw/i2c/pm_smbus.h" #include "hw/pci/pci.h" #include "hw/acpi/acpi.h" #include "sysemu/sysemu.h" #include "qemu/range.h" #include "exec/ioport.h" #include "hw/nvram/fw_cfg.h" #include "exec/address-spaces.h" #include "hw/acpi/piix4.h" //#define DEBUG #ifdef DEBUG # define PIIX4_DPRINTF(format, ...) printf(format, ## __VA_ARGS__) #else # define PIIX4_DPRINTF(format, ...) do { } while (0) #endif #define GPE_BASE 0xafe0 #define GPE_LEN 4 #define PCI_HOTPLUG_ADDR 0xae00 #define PCI_HOTPLUG_SIZE 0x000f #define PCI_UP_BASE 0xae00 #define PCI_DOWN_BASE 0xae04 #define PCI_EJ_BASE 0xae08 #define PCI_RMV_BASE 0xae0c #define PIIX4_PROC_BASE 0xaf00 #define PIIX4_PROC_LEN 32 #define PIIX4_PCI_HOTPLUG_STATUS 2 #define PIIX4_CPU_HOTPLUG_STATUS 4 struct pci_status { uint32_t up; /* deprecated, maintained for migration compatibility */ uint32_t down; }; typedef struct CPUStatus { uint8_t sts[PIIX4_PROC_LEN]; } CPUStatus; typedef struct PIIX4PMState { /*< private >*/ PCIDevice parent_obj; /*< public >*/ MemoryRegion io; uint32_t io_base; MemoryRegion io_gpe; MemoryRegion io_pci; MemoryRegion io_cpu; ACPIREGS ar; APMState apm; PMSMBus smb; uint32_t smb_io_base; qemu_irq irq; qemu_irq smi_irq; int kvm_enabled; Notifier machine_ready; Notifier powerdown_notifier; /* for pci hotplug */ struct pci_status pci0_status; uint32_t pci0_hotplug_enable; uint32_t pci0_slot_device_present; uint8_t disable_s3; uint8_t disable_s4; uint8_t s4_val; CPUStatus gpe_cpu; Notifier cpu_added_notifier; } PIIX4PMState; #define TYPE_PIIX4_PM "PIIX4_PM" #define PIIX4_PM(obj) \ OBJECT_CHECK(PIIX4PMState, (obj), TYPE_PIIX4_PM) static void piix4_acpi_system_hot_add_init(MemoryRegion *parent, PCIBus *bus, PIIX4PMState *s); #define ACPI_ENABLE 0xf1 #define ACPI_DISABLE 0xf0 static void pm_tmr_timer(ACPIREGS *ar) { PIIX4PMState *s = container_of(ar, PIIX4PMState, ar); acpi_update_sci(&s->ar, s->irq); } static void apm_ctrl_changed(uint32_t val, void *arg) { PIIX4PMState *s = arg; PCIDevice *d = PCI_DEVICE(s); /* ACPI specs 3.0, 4.7.2.5 */ acpi_pm1_cnt_update(&s->ar, val == ACPI_ENABLE, val == ACPI_DISABLE); if (d->config[0x5b] & (1 << 1)) { if (s->smi_irq) { qemu_irq_raise(s->smi_irq); } } } static void pm_io_space_update(PIIX4PMState *s) { PCIDevice *d = PCI_DEVICE(s); s->io_base = le32_to_cpu(*(uint32_t *)(d->config + 0x40)); s->io_base &= 0xffc0; memory_region_transaction_begin(); memory_region_set_enabled(&s->io, d->config[0x80] & 1); memory_region_set_address(&s->io, s->io_base); memory_region_transaction_commit(); } static void smbus_io_space_update(PIIX4PMState *s) { PCIDevice *d = PCI_DEVICE(s); s->smb_io_base = le32_to_cpu(*(uint32_t *)(d->config + 0x90)); s->smb_io_base &= 0xffc0; memory_region_transaction_begin(); memory_region_set_enabled(&s->smb.io, d->config[0xd2] & 1); memory_region_set_address(&s->smb.io, s->smb_io_base); memory_region_transaction_commit(); } static void pm_write_config(PCIDevice *d, uint32_t address, uint32_t val, int len) { pci_default_write_config(d, address, val, len); if (range_covers_byte(address, len, 0x80) || ranges_overlap(address, len, 0x40, 4)) { pm_io_space_update((PIIX4PMState *)d); } if (range_covers_byte(address, len, 0xd2) || ranges_overlap(address, len, 0x90, 4)) { smbus_io_space_update((PIIX4PMState *)d); } } static void vmstate_pci_status_pre_save(void *opaque) { struct pci_status *pci0_status = opaque; PIIX4PMState *s = container_of(pci0_status, PIIX4PMState, pci0_status); /* We no longer track up, so build a safe value for migrating * to a version that still does... of course these might get lost * by an old buggy implementation, but we try. */ pci0_status->up = s->pci0_slot_device_present & s->pci0_hotplug_enable; } static int vmstate_acpi_post_load(void *opaque, int version_id) { PIIX4PMState *s = opaque; pm_io_space_update(s); return 0; } #define VMSTATE_GPE_ARRAY(_field, _state) \ { \ .name = (stringify(_field)), \ .version_id = 0, \ .info = &vmstate_info_uint16, \ .size = sizeof(uint16_t), \ .flags = VMS_SINGLE | VMS_POINTER, \ .offset = vmstate_offset_pointer(_state, _field, uint8_t), \ } static const VMStateDescription vmstate_gpe = { .name = "gpe", .version_id = 1, .minimum_version_id = 1, .minimum_version_id_old = 1, .fields = (VMStateField []) { VMSTATE_GPE_ARRAY(sts, ACPIGPE), VMSTATE_GPE_ARRAY(en, ACPIGPE), VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_pci_status = { .name = "pci_status", .version_id = 1, .minimum_version_id = 1, .minimum_version_id_old = 1, .pre_save = vmstate_pci_status_pre_save, .fields = (VMStateField []) { VMSTATE_UINT32(up, struct pci_status), VMSTATE_UINT32(down, struct pci_status), VMSTATE_END_OF_LIST() } }; static int acpi_load_old(QEMUFile *f, void *opaque, int version_id) { PIIX4PMState *s = opaque; int ret, i; uint16_t temp; ret = pci_device_load(PCI_DEVICE(s), f); if (ret < 0) { return ret; } qemu_get_be16s(f, &s->ar.pm1.evt.sts); qemu_get_be16s(f, &s->ar.pm1.evt.en); qemu_get_be16s(f, &s->ar.pm1.cnt.cnt); ret = vmstate_load_state(f, &vmstate_apm, &s->apm, 1); if (ret) { return ret; } timer_get(f, s->ar.tmr.timer); qemu_get_sbe64s(f, &s->ar.tmr.overflow_time); qemu_get_be16s(f, (uint16_t *)s->ar.gpe.sts); for (i = 0; i < 3; i++) { qemu_get_be16s(f, &temp); } qemu_get_be16s(f, (uint16_t *)s->ar.gpe.en); for (i = 0; i < 3; i++) { qemu_get_be16s(f, &temp); } ret = vmstate_load_state(f, &vmstate_pci_status, &s->pci0_status, 1); return ret; } /* qemu-kvm 1.2 uses version 3 but advertised as 2 * To support incoming qemu-kvm 1.2 migration, change version_id * and minimum_version_id to 2 below (which breaks migration from * qemu 1.2). * */ static const VMStateDescription vmstate_acpi = { .name = "piix4_pm", .version_id = 3, .minimum_version_id = 3, .minimum_version_id_old = 1, .load_state_old = acpi_load_old, .post_load = vmstate_acpi_post_load, .fields = (VMStateField []) { VMSTATE_PCI_DEVICE(parent_obj, PIIX4PMState), VMSTATE_UINT16(ar.pm1.evt.sts, PIIX4PMState), VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState), VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState), VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState), VMSTATE_TIMER(ar.tmr.timer, PIIX4PMState), VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState), VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE), VMSTATE_STRUCT(pci0_status, PIIX4PMState, 2, vmstate_pci_status, struct pci_status), VMSTATE_END_OF_LIST() } }; static void acpi_piix_eject_slot(PIIX4PMState *s, unsigned slots) { BusChild *kid, *next; BusState *bus = qdev_get_parent_bus(DEVICE(s)); int slot = ffs(slots) - 1; bool slot_free = true; /* Mark request as complete */ s->pci0_status.down &= ~(1U << slot); QTAILQ_FOREACH_SAFE(kid, &bus->children, sibling, next) { DeviceState *qdev = kid->child; PCIDevice *dev = PCI_DEVICE(qdev); PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev); if (PCI_SLOT(dev->devfn) == slot) { if (pc->no_hotplug) { slot_free = false; } else { object_unparent(OBJECT(qdev)); } } } if (slot_free) { s->pci0_slot_device_present &= ~(1U << slot); } } static void piix4_update_hotplug(PIIX4PMState *s) { BusState *bus = qdev_get_parent_bus(DEVICE(s)); BusChild *kid, *next; /* Execute any pending removes during reset */ while (s->pci0_status.down) { acpi_piix_eject_slot(s, s->pci0_status.down); } s->pci0_hotplug_enable = ~0; s->pci0_slot_device_present = 0; QTAILQ_FOREACH_SAFE(kid, &bus->children, sibling, next) { DeviceState *qdev = kid->child; PCIDevice *pdev = PCI_DEVICE(qdev); PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(pdev); int slot = PCI_SLOT(pdev->devfn); if (pc->no_hotplug) { s->pci0_hotplug_enable &= ~(1U << slot); } s->pci0_slot_device_present |= (1U << slot); } } static void piix4_reset(void *opaque) { PIIX4PMState *s = opaque; PCIDevice *d = PCI_DEVICE(s); uint8_t *pci_conf = d->config; pci_conf[0x58] = 0; pci_conf[0x59] = 0; pci_conf[0x5a] = 0; pci_conf[0x5b] = 0; pci_conf[0x40] = 0x01; /* PM io base read only bit */ pci_conf[0x80] = 0; if (s->kvm_enabled) { /* Mark SMM as already inited (until KVM supports SMM). */ pci_conf[0x5B] = 0x02; } pm_io_space_update(s); piix4_update_hotplug(s); } static void piix4_pm_powerdown_req(Notifier *n, void *opaque) { PIIX4PMState *s = container_of(n, PIIX4PMState, powerdown_notifier); assert(s != NULL); acpi_pm1_evt_power_down(&s->ar); } static void piix4_pm_machine_ready(Notifier *n, void *opaque) { PIIX4PMState *s = container_of(n, PIIX4PMState, machine_ready); PCIDevice *d = PCI_DEVICE(s); MemoryRegion *io_as = pci_address_space_io(d); uint8_t *pci_conf; pci_conf = d->config; pci_conf[0x5f] = 0x10 | (memory_region_present(io_as, 0x378) ? 0x80 : 0); pci_conf[0x63] = 0x60; pci_conf[0x67] = (memory_region_present(io_as, 0x3f8) ? 0x08 : 0) | (memory_region_present(io_as, 0x2f8) ? 0x90 : 0); } static void piix4_pm_add_propeties(PIIX4PMState *s) { static const uint8_t acpi_enable_cmd = ACPI_ENABLE; static const uint8_t acpi_disable_cmd = ACPI_DISABLE; static const uint32_t gpe0_blk = GPE_BASE; static const uint32_t gpe0_blk_len = GPE_LEN; static const uint16_t sci_int = 9; object_property_add_uint8_ptr(OBJECT(s), ACPI_PM_PROP_ACPI_ENABLE_CMD, &acpi_enable_cmd, NULL); object_property_add_uint8_ptr(OBJECT(s), ACPI_PM_PROP_ACPI_DISABLE_CMD, &acpi_disable_cmd, NULL); object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_GPE0_BLK, &gpe0_blk, NULL); object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_GPE0_BLK_LEN, &gpe0_blk_len, NULL); object_property_add_uint16_ptr(OBJECT(s), ACPI_PM_PROP_SCI_INT, &sci_int, NULL); object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_PM_IO_BASE, &s->io_base, NULL); } static int piix4_pm_initfn(PCIDevice *dev) { PIIX4PMState *s = PIIX4_PM(dev); uint8_t *pci_conf; pci_conf = dev->config; pci_conf[0x06] = 0x80; pci_conf[0x07] = 0x02; pci_conf[0x09] = 0x00; pci_conf[0x3d] = 0x01; // interrupt pin 1 /* APM */ apm_init(dev, &s->apm, apm_ctrl_changed, s); if (s->kvm_enabled) { /* Mark SMM as already inited to prevent SMM from running. KVM does not * support SMM mode. */ pci_conf[0x5B] = 0x02; } /* XXX: which specification is used ? The i82731AB has different mappings */ pci_conf[0x90] = s->smb_io_base | 1; pci_conf[0x91] = s->smb_io_base >> 8; pci_conf[0xd2] = 0x09; pm_smbus_init(DEVICE(dev), &s->smb); memory_region_set_enabled(&s->smb.io, pci_conf[0xd2] & 1); memory_region_add_subregion(pci_address_space_io(dev), s->smb_io_base, &s->smb.io); memory_region_init(&s->io, OBJECT(s), "piix4-pm", 64); memory_region_set_enabled(&s->io, false); memory_region_add_subregion(pci_address_space_io(dev), 0, &s->io); acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io); acpi_pm1_evt_init(&s->ar, pm_tmr_timer, &s->io); acpi_pm1_cnt_init(&s->ar, &s->io, s->s4_val); acpi_gpe_init(&s->ar, GPE_LEN); s->powerdown_notifier.notify = piix4_pm_powerdown_req; qemu_register_powerdown_notifier(&s->powerdown_notifier); s->machine_ready.notify = piix4_pm_machine_ready; qemu_add_machine_init_done_notifier(&s->machine_ready); qemu_register_reset(piix4_reset, s); piix4_acpi_system_hot_add_init(pci_address_space_io(dev), dev->bus, s); piix4_pm_add_propeties(s); return 0; } Object *piix4_pm_find(void) { bool ambig; Object *o = object_resolve_path_type("", TYPE_PIIX4_PM, &ambig); if (ambig || !o) { return NULL; } return o; } i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base, qemu_irq sci_irq, qemu_irq smi_irq, int kvm_enabled, FWCfgState *fw_cfg) { DeviceState *dev; PIIX4PMState *s; dev = DEVICE(pci_create(bus, devfn, TYPE_PIIX4_PM)); qdev_prop_set_uint32(dev, "smb_io_base", smb_io_base); s = PIIX4_PM(dev); s->irq = sci_irq; s->smi_irq = smi_irq; s->kvm_enabled = kvm_enabled; qdev_init_nofail(dev); if (fw_cfg) { uint8_t suspend[6] = {128, 0, 0, 129, 128, 128}; suspend[3] = 1 | ((!s->disable_s3) << 7); suspend[4] = s->s4_val | ((!s->disable_s4) << 7); fw_cfg_add_file(fw_cfg, "etc/system-states", g_memdup(suspend, 6), 6); } return s->smb.smbus; } static Property piix4_pm_properties[] = { DEFINE_PROP_UINT32("smb_io_base", PIIX4PMState, smb_io_base, 0), DEFINE_PROP_UINT8(ACPI_PM_PROP_S3_DISABLED, PIIX4PMState, disable_s3, 0), DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_DISABLED, PIIX4PMState, disable_s4, 0), DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_VAL, PIIX4PMState, s4_val, 2), DEFINE_PROP_END_OF_LIST(), }; static void piix4_pm_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); k->no_hotplug = 1; k->init = piix4_pm_initfn; k->config_write = pm_write_config; k->vendor_id = PCI_VENDOR_ID_INTEL; k->device_id = PCI_DEVICE_ID_INTEL_82371AB_3; k->revision = 0x03; k->class_id = PCI_CLASS_BRIDGE_OTHER; dc->desc = "PM"; dc->vmsd = &vmstate_acpi; dc->props = piix4_pm_properties; /* * Reason: part of PIIX4 southbridge, needs to be wired up, * e.g. by mips_malta_init() */ dc->cannot_instantiate_with_device_add_yet = true; } static const TypeInfo piix4_pm_info = { .name = TYPE_PIIX4_PM, .parent = TYPE_PCI_DEVICE, .instance_size = sizeof(PIIX4PMState), .class_init = piix4_pm_class_init, }; static void piix4_pm_register_types(void) { type_register_static(&piix4_pm_info); } type_init(piix4_pm_register_types) static uint64_t gpe_readb(void *opaque, hwaddr addr, unsigned width) { PIIX4PMState *s = opaque; uint32_t val = acpi_gpe_ioport_readb(&s->ar, addr); PIIX4_DPRINTF("gpe read %" HWADDR_PRIx " == %" PRIu32 "\n", addr, val); return val; } static void gpe_writeb(void *opaque, hwaddr addr, uint64_t val, unsigned width) { PIIX4PMState *s = opaque; acpi_gpe_ioport_writeb(&s->ar, addr, val); acpi_update_sci(&s->ar, s->irq); PIIX4_DPRINTF("gpe write %" HWADDR_PRIx " <== %" PRIu64 "\n", addr, val); } static const MemoryRegionOps piix4_gpe_ops = { .read = gpe_readb, .write = gpe_writeb, .valid.min_access_size = 1, .valid.max_access_size = 4, .impl.min_access_size = 1, .impl.max_access_size = 1, .endianness = DEVICE_LITTLE_ENDIAN, }; static uint64_t pci_read(void *opaque, hwaddr addr, unsigned int size) { PIIX4PMState *s = opaque; uint32_t val = 0; switch (addr) { case PCI_UP_BASE - PCI_HOTPLUG_ADDR: /* Manufacture an "up" value to cause a device check on any hotplug * slot with a device. Extra device checks are harmless. */ val = s->pci0_slot_device_present & s->pci0_hotplug_enable; PIIX4_DPRINTF("pci_up_read %" PRIu32 "\n", val); break; case PCI_DOWN_BASE - PCI_HOTPLUG_ADDR: val = s->pci0_status.down; PIIX4_DPRINTF("pci_down_read %" PRIu32 "\n", val); break; case PCI_EJ_BASE - PCI_HOTPLUG_ADDR: /* No feature defined yet */ PIIX4_DPRINTF("pci_features_read %" PRIu32 "\n", val); break; case PCI_RMV_BASE - PCI_HOTPLUG_ADDR: val = s->pci0_hotplug_enable; break; default: break; } return val; } static void pci_write(void *opaque, hwaddr addr, uint64_t data, unsigned int size) { switch (addr) { case PCI_EJ_BASE - PCI_HOTPLUG_ADDR: acpi_piix_eject_slot(opaque, (uint32_t)data); PIIX4_DPRINTF("pciej write %" HWADDR_PRIx " <== %" PRIu64 "\n", addr, data); break; default: break; } } static const MemoryRegionOps piix4_pci_ops = { .read = pci_read, .write = pci_write, .endianness = DEVICE_LITTLE_ENDIAN, .valid = { .min_access_size = 4, .max_access_size = 4, }, }; static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size) { PIIX4PMState *s = opaque; CPUStatus *cpus = &s->gpe_cpu; uint64_t val = cpus->sts[addr]; return val; } static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data, unsigned int size) { /* TODO: implement VCPU removal on guest signal that CPU can be removed */ } static const MemoryRegionOps cpu_hotplug_ops = { .read = cpu_status_read, .write = cpu_status_write, .endianness = DEVICE_LITTLE_ENDIAN, .valid = { .min_access_size = 1, .max_access_size = 1, }, }; typedef enum { PLUG, UNPLUG, } HotplugEventType; static void piix4_cpu_hotplug_req(PIIX4PMState *s, CPUState *cpu, HotplugEventType action) { CPUStatus *g = &s->gpe_cpu; ACPIGPE *gpe = &s->ar.gpe; CPUClass *k = CPU_GET_CLASS(cpu); int64_t cpu_id; assert(s != NULL); *gpe->sts = *gpe->sts | PIIX4_CPU_HOTPLUG_STATUS; cpu_id = k->get_arch_id(CPU(cpu)); if (action == PLUG) { g->sts[cpu_id / 8] |= (1 << (cpu_id % 8)); } else { g->sts[cpu_id / 8] &= ~(1 << (cpu_id % 8)); } acpi_update_sci(&s->ar, s->irq); } static void piix4_cpu_added_req(Notifier *n, void *opaque) { PIIX4PMState *s = container_of(n, PIIX4PMState, cpu_added_notifier); piix4_cpu_hotplug_req(s, CPU(opaque), PLUG); } static int piix4_device_hotplug(DeviceState *qdev, PCIDevice *dev, PCIHotplugState state); static void piix4_acpi_system_hot_add_init(MemoryRegion *parent, PCIBus *bus, PIIX4PMState *s) { CPUState *cpu; memory_region_init_io(&s->io_gpe, OBJECT(s), &piix4_gpe_ops, s, "acpi-gpe0", GPE_LEN); memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe); memory_region_init_io(&s->io_pci, OBJECT(s), &piix4_pci_ops, s, "acpi-pci-hotplug", PCI_HOTPLUG_SIZE); memory_region_add_subregion(parent, PCI_HOTPLUG_ADDR, &s->io_pci); pci_bus_hotplug(bus, piix4_device_hotplug, DEVICE(s)); CPU_FOREACH(cpu) { CPUClass *cc = CPU_GET_CLASS(cpu); int64_t id = cc->get_arch_id(cpu); g_assert((id / 8) < PIIX4_PROC_LEN); s->gpe_cpu.sts[id / 8] |= (1 << (id % 8)); } memory_region_init_io(&s->io_cpu, OBJECT(s), &cpu_hotplug_ops, s, "acpi-cpu-hotplug", PIIX4_PROC_LEN); memory_region_add_subregion(parent, PIIX4_PROC_BASE, &s->io_cpu); s->cpu_added_notifier.notify = piix4_cpu_added_req; qemu_register_cpu_added_notifier(&s->cpu_added_notifier); } static void enable_device(PIIX4PMState *s, int slot) { s->ar.gpe.sts[0] |= PIIX4_PCI_HOTPLUG_STATUS; s->pci0_slot_device_present |= (1U << slot); } static void disable_device(PIIX4PMState *s, int slot) { s->ar.gpe.sts[0] |= PIIX4_PCI_HOTPLUG_STATUS; s->pci0_status.down |= (1U << slot); } static int piix4_device_hotplug(DeviceState *qdev, PCIDevice *dev, PCIHotplugState state) { int slot = PCI_SLOT(dev->devfn); PIIX4PMState *s = PIIX4_PM(qdev); /* Don't send event when device is enabled during qemu machine creation: * it is present on boot, no hotplug event is necessary. We do send an * event when the device is disabled later. */ if (state == PCI_COLDPLUG_ENABLED) { s->pci0_slot_device_present |= (1U << slot); return 0; } if (state == PCI_HOTPLUG_ENABLED) { enable_device(s, slot); } else { disable_device(s, slot); } acpi_update_sci(&s->ar, s->irq); return 0; }